There are 1000 or so California native bees. I recently watched one of them pollinating the blossoms on my tomato plants here in Anchor Bay. When it went into each blossom it gave a whirring sound just like a small drill. Will Erickson identified it for me - it's a female Solitary Digger Bee, Anthophora species. This native bee is a ground nester. She was indeed a busy little bee as my plants are full of blossoms. Nice to get some garden help from this beneficial bee!